Things I have recently swept out of Elliot and (mostly) Finnley's mouths:
Bark, definitely their fave.
Dirt, Finnley shoved a fistful in her mouth, enough to make her gag. No lesson learned, however.
The little end off oranges
Random plastic trash (where do they find this crap??)
One day we went for a walk and Elliot was getting fussy in the stroller, so I strapped on the Boba and put her on. She remained somewhat fussy, which is unusual. Half hour later.. I discover a piece of bark in her mouth. She'd just been working away on it, like a piece of chewing gum. Apparently they lack the skill of spitting things out themselves? She was mad at first when I swept it out of her mouth, but didn't fuss anymore about it. Weirdo.